[英]React native with redux shopping cart
我正在尝试在本机反应中创建购物车,我的问题是每当我将产品添加到购物车时,它都是通过以下操作添加的:
export const addToCart = (item) => {
return (dispatch) =>{
dispatch({
type:ADD_TO_CART,
payload: {item}});
}
}
这是减速机:
import {REMOVE_FROM_CART,ADD_TO_CART,UPDATE_CART_QUANTITY,GET_CATEGORIES, GET_PRODUCTS,
MODAL_STATE,MODAL_STATE_HIDE,ADDRESS_CHANGED,SELECTED_ITEMS} from '../actions/types';
const INITIAL_STATE = {
products:'',
cart:[],
category:'',
isVisible:false,
address:'',
selectedItem:[]
}
export default function(state=INITIAL_STATE, action){
let cart = state.cart;
switch(action.type){
case ADD_TO_CART:
return{...state, cart:[...state.cart, action.payload]}
case REMOVE_FROM_CART:
return{cart:[...state.cart.filter(item => item.id != action.payload)]}
// {...state, cart:[...state.cart.filter((id)=>{ id !== action.payload})]}
case UPDATE_CART_QUANTITY:
return {
...state,
cart: state.cart.map(cart=> cart.id === action.payload.item.id ?
{ ...cart, quantity: action.payload.value} :
cart
)
};
case GET_CATEGORIES:
return{...state, category:action.payload}
case GET_PRODUCTS:
return{...state, products:action.payload}
case MODAL_STATE:
return{...state, isVisible:true}
case MODAL_STATE_HIDE:
return{...state, isVisible:false}
case ADDRESS_CHANGED:
return{...state, address:action.payload}
case SELECTED_ITEMS:
return{...state, selectedItem:[...state.selectedItem, action.payload]}
default:
return state
}
}
但是当我尝试通过将 state 映射到购物车组件中的道具来访问购物车时,它返回 undefined is not an object,当控制台记录来自购物车组件的 typeof(cart) 时,它说它是 ZA8CFDE6331BD59EB2AC96F8911B666Z:
这是mapstatetoprops function:
const mapStateToProps = (state) => {
return{
cartItems:state.product_reducer.cart,
modalValue:state.product_reducer.isVisible,
total: state.product_reducer.cart.reduce(
in the array
(accumulatedTotal, cartItem) =>
accumulatedTotal + cartItem.price * cartItem.quantity,
0
)
}
}
这是我添加到购物车中的 json 产品数据,其中有两个产品的 ID 为 7 和 8:
{
"product": [
{
"id": 8,
"name": "asad",
"quantity": 1,
"type": "already",
"description": null,
"price": "20000.00",
"ingredients": null,
"deliveryfee": "0.00",
"supplier": null,
"duration": "3",
"category_id": 3,
"created_at": "2020-05-03 15:03:23",
"updated_at": "2020-05-03 15:03:23",
"deleted_at": null,
"photo": {
"id": 19,
"model_type": "App\\Product",
"model_id": 8,
"collection_name": "photo",
"name": "5eaedd370c100_jamies-iced-green-tea",
"file_name": "5eaedd370c100_jamies-iced-green-tea.jpg",
"mime_type": "image/jpeg",
"disk": "public",
"size": 36610,
"manipulations": [],
"custom_properties": {
"generated_conversions": {
"thumb": true
}
},
"responsive_images": [],
"order_column": 19,
"created_at": "2020-05-03 15:03:24",
"updated_at": "2020-05-03 15:03:24",
"url": "http://192.168.0.112/kwenu/storage/app/public/19/5eaedd370c100_jamies-iced-green-tea.jpg",
"thumbnail": "http://192.168.0.112/kwenu/storage/app/public/19/conversions/5eaedd370c100_jamies-iced-green-tea-thumb.jpg"
},
"sliderimages": [],
"tags": [
{
"id": 1,
"name": "Avocado",
"supplier": null,
"created_at": "2020-04-23 09:35:00",
"updated_at": "2020-04-23 09:35:00",
"deleted_at": null,
"picture": [],
"pivot": {
"product_id": 8,
"product_tag_id": 1
},
"media": []
},
{
"id": 2,
"name": "cushew",
"supplier": "Fruit Salads",
"created_at": "2020-04-27 13:03:35",
"updated_at": "2020-04-27 13:03:35",
"deleted_at": null,
"picture": [],
"pivot": {
"product_id": 8,
"product_tag_id": 2
},
"media": []
}
],
"media": [
{
"id": 19,
"model_type": "App\\Product",
"model_id": 8,
"collection_name": "photo",
"name": "5eaedd370c100_jamies-iced-green-tea",
"file_name": "5eaedd370c100_jamies-iced-green-tea.jpg",
"mime_type": "image/jpeg",
"disk": "public",
"size": 36610,
"manipulations": [],
"custom_properties": {
"generated_conversions": {
"thumb": true
}
},
"responsive_images": [],
"order_column": 19,
"created_at": "2020-05-03 15:03:24",
"updated_at": "2020-05-03 15:03:24",
"url": "http://192.168.0.112/kwenu/storage/app/public/19/5eaedd370c100_jamies-iced-green-tea.jpg",
"thumbnail": "http://192.168.0.112/kwenu/storage/app/public/19/conversions/5eaedd370c100_jamies-iced-green-tea-thumb.jpg"
}
]
},
{
"id": 7,
"name": "Fruity",
"quantity": 1,
"type": "own",
"description": null,
"price": "18000.00",
"ingredients": null,
"deliveryfee": "0.00",
"supplier": null,
"duration": "1",
"category_id": 2,
"created_at": "2020-05-03 11:06:52",
"updated_at": "2020-05-03 11:06:52",
"deleted_at": null,
"photo": {
"id": 18,
"model_type": "App\\Product",
"model_id": 7,
"collection_name": "photo",
"name": "5eaea5c67a659_grilledchicken",
"file_name": "5eaea5c67a659_grilledchicken.jpg",
"mime_type": "image/jpeg",
"disk": "public",
"size": 13069,
"manipulations": [],
"custom_properties": {
"generated_conversions": {
"thumb": true
}
},
"responsive_images": [],
"order_column": 18,
"created_at": "2020-05-03 11:06:53",
"updated_at": "2020-05-03 11:06:56",
"url": "http://192.168.0.112/kwenu/storage/app/public/18/5eaea5c67a659_grilledchicken.jpg",
"thumbnail": "http://192.168.0.112/kwenu/storage/app/public/18/conversions/5eaea5c67a659_grilledchicken-thumb.jpg"
},
"sliderimages": [],
"tags": [
{
"id": 1,
"name": "Avocado",
"supplier": null,
"created_at": "2020-04-23 09:35:00",
"updated_at": "2020-04-23 09:35:00",
"deleted_at": null,
"picture": [],
"pivot": {
"product_id": 7,
"product_tag_id": 1
},
"media": []
},
{
"id": 2,
"name": "cushew",
"supplier": "Fruit Salads",
"created_at": "2020-04-27 13:03:35",
"updated_at": "2020-04-27 13:03:35",
"deleted_at": null,
"picture": [],
"pivot": {
"product_id": 7,
"product_tag_id": 2
},
"media": []
}
],
"media": [
{
"id": 18,
"model_type": "App\\Product",
"model_id": 7,
"collection_name": "photo",
"name": "5eaea5c67a659_grilledchicken",
"file_name": "5eaea5c67a659_grilledchicken.jpg",
"mime_type": "image/jpeg",
"disk": "public",
"size": 13069,
"manipulations": [],
"custom_properties": {
"generated_conversions": {
"thumb": true
}
},
"responsive_images": [],
"order_column": 18,
"created_at": "2020-05-03 11:06:53",
"updated_at": "2020-05-03 11:06:56",
"url": "http://192.168.0.112/kwenu/storage/app/public/18/5eaea5c67a659_grilledchicken.jpg",
"thumbnail": "http://192.168.0.112/kwenu/storage/app/public/18/conversions/5eaea5c67a659_grilledchicken-thumb.jpg"
}
]
}
]
}
问题不是 STATE 作为对象数组返回购物车,它返回一个 OBJECT 对象,提前谢谢你
我看到 addToCart 操作将有效负载作为 object { item } 并且您尝试通过 action.payload 在没有 item 的情况下访问 reducer
所以你可以改变
case ADD_TO_CART:
return{...state, cart:[...state.cart, action.payload.item]}
或者只是将添加到购物车更新为这样 && 所有操作都应该相同
export const addToCart = (payload) => {
return (dispatch) =>{
dispatch({
type:ADD_TO_CART,
payload
}
}
通过更改减速器中的购物车数组的名称来修复它
const INITIAL_STATE = {
products:'',
大车:[],
category:'',
isVisible:false,
address:'',
selectedItem:[]
}
至:
const INITIAL_STATE = {
products:'',
购物车:[],
category:'',
isVisible:false,
address:'',
selectedItem:[]
}
并创建一个 class function 用于渲染购物车组件中的项目,我提供给平面列表中的渲染项 function 现在购物车返回一个对象数组。 感谢您的关注
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